Random regression models on Legendre polynomials to estimate genetic parameters for weights from birth to adult age in Canchim cattle

Journal of Animal Breeding and Genetics = Zeitschrift Für Tierzüchtung Und Züchtungsbiologie
F BaldiM M Alencar

Abstract

The objective of this work was to estimate covariance functions for direct and maternal genetic effects, animal and maternal permanent environmental effects, and subsequently, to derive relevant genetic parameters for growth traits in Canchim cattle. Data comprised 49,011 weight records on 2435 females from birth to adult age. The model of analysis included fixed effects of contemporary groups (year and month of birth and at weighing) and age of dam as quadratic covariable. Mean trends were taken into account by a cubic regression on orthogonal polynomials of animal age. Residual variances were allowed to vary and were modelled by a step function with 1, 4 or 11 classes based on animal's age. The model fitting four classes of residual variances was the best. A total of 12 random regression models from second to seventh order were used to model direct and maternal genetic effects, animal and maternal permanent environmental effects. The model with direct and maternal genetic effects, animal and maternal permanent environmental effects fitted by quadric, cubic, quintic and linear Legendre polynomials, respectively, was the most adequate to describe the covariance structure of the data. Estimates of direct and maternal heritabilit...Continue Reading

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Citations

Apr 16, 2014·PloS One·Marcos E BuzanskasDanísio P Munari
Mar 21, 2013·Genetics and Molecular Research : GMR·R R MotaR A Torres
Jan 11, 2014·Animal : an International Journal of Animal Bioscience·D C B ScalezF L B Toral
Nov 17, 2010·Journal of Animal Breeding and Genetics = Zeitschrift Für Tierzüchtung Und Züchtungsbiologie·F BaldiL G Albuquerque
May 10, 2016·Journal of Animal Science and Biotechnology·Ismael UrbinatiDanísio Prado Munari
Dec 23, 2016·Animal Science Journal = Nihon Chikusan Gakkaihō·Flavia Rita FerreiraHumberto Tonhati
Aug 26, 2014·Journal of Animal Science·M DufrasneN Gengler
Nov 17, 2017·Animal : an International Journal of Animal Bioscience·A P N TerakadoL G de Albuquerque
Mar 24, 2012·Animal : an International Journal of Animal Bioscience·S A RafatI David
Sep 20, 2020·Journal of Animal Breeding and Genetics = Zeitschrift Für Tierzüchtung Und Züchtungsbiologie·Shinichiro OgawaMasahiro Satoh
Aug 31, 2017·Journal of Animal Science and Biotechnology·Marcos Eli BuzanskasDanísio Prado Munari

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